v3.26.1
Segment Financial Information - Revenue and Disbursement of Costs and Expenses by Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jul. 04, 2026
Jun. 28, 2025
Jul. 04, 2026
Jun. 28, 2025
Segment Reporting [Line Items]        
Revenues $ 3,827 $ 3,716 $ 7,522 $ 7,022
Costs, expenses and other        
Research and development costs 116 137 236 269
Selling and administrative expense 311 303 632 601
Interest expense, net 33 31 67 60
Operating Segment        
Segment Reporting [Line Items]        
Revenues 3,827 3,716 7,522 7,022
Costs, expenses and other        
Cost of products/services sold 3,085 2,961 6,061 5,596
Research and development costs 114 133 232 256
Selling and administrative expense 271 265 547 519
Interest expense, net 4 5 9 9
Segment profit (loss) 353 352 673 642
Textron Aviation        
Segment Reporting [Line Items]        
Revenues 1,544 1,522 3,029 2,738
Bell        
Segment Reporting [Line Items]        
Revenues 1,074 1,016 2,144 1,999
Textron Systems        
Segment Reporting [Line Items]        
Revenues 347 324 685 623
Industrial        
Segment Reporting [Line Items]        
Revenues 848 839 1,634 1,631
Finance        
Segment Reporting [Line Items]        
Revenues 14 15 30 31
Manufacturing group | Textron Aviation | Operating Segment        
Segment Reporting [Line Items]        
Revenues 1,544 1,522 3,029 2,738
Costs, expenses and other        
Cost of products/services sold 1,204 1,178 2,357 2,111
Research and development costs 58 59 114 119
Selling and administrative expense 117 115 239 216
Interest expense, net 0 0 0 0
Segment profit (loss) 165 170 319 292
Manufacturing group | Bell | Operating Segment        
Segment Reporting [Line Items]        
Revenues 1,074 1,016 2,144 1,999
Costs, expenses and other        
Cost of products/services sold 917 841 1,821 1,644
Research and development costs 27 38 64 77
Selling and administrative expense 55 57 112 108
Interest expense, net 0 0 0 0
Segment profit (loss) 75 80 147 170
Manufacturing group | Textron Systems | Operating Segment        
Segment Reporting [Line Items]        
Revenues 347 324 685 623
Costs, expenses and other        
Cost of products/services sold 267 244 525 465
Research and development costs 10 16 19 26
Selling and administrative expense 26 24 55 54
Interest expense, net 0 0 0 0
Segment profit (loss) 44 40 86 78
Manufacturing group | Industrial | Operating Segment        
Segment Reporting [Line Items]        
Revenues 848 839 1,634 1,631
Costs, expenses and other        
Cost of products/services sold 697 698 1,358 1,376
Research and development costs 19 20 35 34
Selling and administrative expense 73 67 142 137
Interest expense, net 0 0 0 0
Segment profit (loss) 59 54 99 84
Finance group        
Segment Reporting [Line Items]        
Revenues 14 15 30 31
Finance group | Finance | Operating Segment        
Segment Reporting [Line Items]        
Revenues 14 15 30 31
Costs, expenses and other        
Cost of products/services sold 0 0 0 0
Research and development costs 0 0 0 0
Selling and administrative expense 0 2 (1) 4
Interest expense, net 4 5 9 9
Segment profit (loss) $ 10 $ 8 $ 22 $ 18